Microstructure of epitaxially oriented superconducting YBa2Cu3O7-x films grown on (100) MgO by metalorganic decomposition

Lee, S.-Tong; Chen, Samuel; Hung, L. S.; Braunstein, G.
July 1989
Applied Physics Letters;7/17/1989, Vol. 55 Issue 3, p286
Academic Journal
The microstructure in epitaxially oriented thin films of YBa[sub 2]Cu[sub 3]O[sub 7 - x] grown on (100) MgO by metatorganic decomposition has been studied by transmission electron microscopy and ion channeling. The as-prepared films consisted of single-crystal platelets lying fiat on the MgO surface. The majority of the crystallites showed perfect alignment of their c axis with the [100] axis of MgO, while some crystallites were found to have a misorientation of up to 7.5°. Images of the interracial regions showed good epitaxial growth to within one lattice spacing of the MgO substrate. He[sup ++] channeling measurements as a function of energy from 1 to 4.5 MeV indicated a 0.51° spread in crystallite orientation. Extrapolation of the channeling measurements to the limit of zero crystallite spread gave a minimum yield of 0.20 for bulk YBa[sub 2]Cu[sub 3]O[sub 7 - x], which is much larger than the value reported for single crystals. The large backscattering yield is attributed to the grain boundaries in the film. A relatively strain-free interface was indicated by channeling results.


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